How does PageSourceSearch know what ugo.cz is built with?

From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.

How far back does the history of ugo.cz go?

To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.

Can I see an older version of a script from ugo.cz?

Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.

Which other websites use the same tracking IDs as ugo.cz?

Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Site profile

ugo.cz

Built with gtm, webpack, @clerk/ui 1.34.0, algoliasearch.zendesk-hc 3.0.0, gather-vue 8.20.3, @blotoutio/providers-blotout-consent-sdk 1.73.0, cloudinary-video-player 4.1.2, maplibre-gl 6.11.1, dashjs 5.2.1, @inkeep/cxkit-js 0.5.119, @mux/mux-player 3.13.4, in-renderer-js 1.2.3 and more. 5 pages and 135 stored files, last crawled 2026-10-02.

rank 1,264,778 51 libraries 3 identifiers 36 third-party hosts 1 crawl open the site

Technologies and libraries

Recognised by fingerprinting the stored files and bundles against known releases; a version is the release the bytes match.

Library	Version	Seen
gtm		2026-10-02
webpack		2026-10-02
@clerk/ui	1.34.0	2026-10-02
algoliasearch.zendesk-hc	3.0.0	2026-10-02
gather-vue	8.20.3	2026-10-02
@blotoutio/providers-blotout-consent-sdk	1.73.0	2026-10-02
cloudinary-video-player	4.1.2	2026-10-02
maplibre-gl	6.11.1	2026-10-02
dashjs	5.2.1	2026-10-02
@inkeep/cxkit-js	0.5.119	2026-10-02
@mux/mux-player	3.13.4	2026-10-02
in-renderer-js	1.2.3	2026-10-02
@feathery/react	2.96.0	2026-10-02
@reachfive/identity-core	1.42.0	2026-10-02
@reachfive/identity-ui	2.1.0	2026-10-02
jspdf	4.2.1	2026-10-02
oidc-client	1.11.5	2026-10-02
exceljs	4.4.0	2026-10-02
@sentry-internal/replay	10.57.0	2026-10-02
cloudflare-insights		2026-10-02
cloudflare-email-decode		2026-10-02
spectorjs	0.9.33	2026-10-02
@moveo-ai/web-client	0.119.0	2026-10-02
esri-leaflet-vector	4.3.2	2026-10-02
@videojs/cdn	10.0.0-rc.2	2026-10-02
hapi-video	1.2.2	2026-10-02
webex	3.12.0	2026-10-02
ovenplayer	0.10.54	2026-10-02
extra-map-card	1.8.0	2026-10-02
graphql-playground-react	1.7.28	2026-10-02
@recogito/annotorious	2.7.14	2026-10-02
webcrypto	0.1.1	2026-10-02
javascript-obfuscator	5.8.0	2026-10-02
olamaps-web-sdk	1.4.0	2026-10-02
ogm-viewer	1.4.0	2026-10-02
replaywebpage	2.5.3	2026-10-02
tonweb	0.0.66	2026-10-02
@accusoft/pdf-viewer	3.11.158639	2026-10-02
@ant-design/x	2.9.0	2026-10-02
mori-chat-widget	2.0.49	2026-10-02
playable	2.15.4	2026-10-02
@watergis/mapbox-gl-export	4.0.0	2026-10-02
wonder-image	2.1.2-alpha.4	2026-10-02
@joyfill/components	4.0.0-rc26	2026-10-02
machinelearn	2.1.5	2026-10-02
@panoramax/web-viewer	5.3.0	2026-10-02
@chativa/connector-directline	0.15.0	2026-10-02
coherentpdf	2.5.5	2026-10-02
webtorrent	3.0.21	2026-09-25
@walletconnect/client	1.8.0	2026-09-25
@descope/web-components-ui	3.21.0	2026-09-25

Tracking, tag and verification IDs

Public identifiers read out of the source. Each links to every other site in the index that carries the same one.

What	Value	Found in
Google site verification (Google)	wOQChKjG1QW_KeRUt4uANQc2tX5aAUjgcCew9C0YEEk	view source
Google Tag Manager container (Google)	GTM-MKZCFD2K	view source
Sentry DSN host (Sentry)	o4510940347564032.ingest.de.sentry.io	view source

Third-party hosts

Hosts outside ugo.cz that its pages load scripts, frames or stylesheets from, and that its own scripts name in absolute URLs (connect). Each links to every site loading from the same host.

Host	Loaded as	Found in
aomedia.org	connect	view source
api.maptiler.com	connect	view source
app.posthog.com	connect	view source
dashif.org	connect	view source
errors.authjs.dev	connect	view source
example.com	connect	view source
fast.wistia.com	connect	view source
github.com	connect	view source
img.litix.io	connect	view source
json-schema.org	connect	view source
lexical.dev	connect	view source
maplibre.org	connect	view source
noembed.com	connect	view source
open.spotify.com	connect	view source
player.twitch.tv	connect	view source
player.vimeo.com	connect	view source
react.dev	connect	view source
schemas.xmlsoap.org	connect	view source
sentry.io	connect	view source
simplemaps.com	connect	view source
static.cloudflareinsights.com	script	view source
time.akamai.com	connect	view source
us.i.posthog.com	connect	view source
us.posthog.com	connect	view source
vimeo.com	connect	view source
www.google.com	connect	view source
www.googletagmanager.com	iframe	view source
www.gstatic.com	connect	view source
www.maptiler.com	connect	view source
www.mux.com	connect	view source
www.smpte-ra.org	connect	view source
www.tiktok.com	connect	view source
www.w3.org	connect	view source
www.youtube-nocookie.com	connect	view source
www.youtube.com	connect	view source
yandex.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 135) }. Versions are the crawls at which the file was new or its content changed; each opens the file as it was then, rebuilt from the same stored chunks.

File	Kind	Size	Collected	Versions
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https://www.ugo.cz/_next/static/chunks/39231027-5862a00dd8bd3e9b.js	js	6.3 KB	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/app/(fron…/layout-d9a64b67b5173f39.js	js	4.2 KB	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/8354-90cf187ff5bfbf7f.js	js	85.7 KB	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/538-8a40775f38361e74.js	js	117 KB	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/3224-4f734b286bf58144.js	js	22.2 KB	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/4138-d4a87adc2edbc4b8.js	js	47.5 KB	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/7148e971-cc324cd81d43d782.js	js	318.2 KB	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/app/global-error-dab00af3f1f5af38.js	js	930 B	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/main-app-6100d969842ff3f5.js	js	10.8 KB	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/6137-648dea88433f3694.js	js	676 KB	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/fe39b963-61cc7891b8f32e90.js	js	184.7 KB	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/34df0fd8-eeeefdc0b17e554e.js	js	169.3 KB	2026-10-02	current
https://www.ugo.cz/_next/static/chunks/d0d8b9b4-5a865d4ab650f5c6.js	js	119.2 KB	2026-10-02	current
https://www.ugo.cz/cs/kariera	html	373.3 KB	2026-10-02	2026-10-02
https://www.ugo.cz/cs/nas-pribeh	html	527.7 KB	2026-10-02	2026-10-02
https://www.ugo.cz/cs/blog/clanek/dyne-petkrat-jinak-nuda-ani-jednou	html	281.4 KB	2026-10-02	2026-10-02
https://www.ugo.cz/cs/blog	html	284.2 KB	2026-10-02	2026-10-02
https://www.ugo.cz/cs	html	448.2 KB	2026-10-02	2026-10-02

Timeline

One entry per crawl, newest first, with what changed since the crawl before: libraries, identifiers, third-party hosts and files. Historical versions stay viewable because the stored chunks are shared between versions, never copied.

2026-10-02 first crawl

5 pages, 135 files, 8.7 MB; 50 libraries, 3 identifiers, 36 third-party hosts
50 libraries added
- gtm
- cloudflare-email-decode
- @sentry-internal/replay 10.57.0
- @ant-design/x 2.9.0
- @inkeep/cxkit-js 0.5.119
- @clerk/ui 1.34.0
- @moveo-ai/web-client 0.117.0
- @joyfill/components 4.0.0-rc26
- mori-chat-widget 2.0.49
- spectorjs 0.9.33
- algoliasearch.zendesk-hc 3.0.0
- tonweb 0.0.66
- and 38 more
3 identifiers added
- GTM-MKZCFD2K Google Tag Manager container
- wOQChKjG1QW_KeRUt4uANQc2tX5aAUjgcCew9C0YEEk Google site verification
- o4510940347564032.ingest.de.sentry.io Sentry DSN host
36 third-party hosts added
- static.cloudflareinsights.com
- www.googletagmanager.com
- react.dev
- www.w3.org
- yandex.com
- sentry.io
- app.posthog.com
- us.i.posthog.com
- us.posthog.com
- example.com
- json-schema.org
- errors.authjs.dev
- and 24 more
135 files added

Questions about ugo.cz

How does PageSourceSearch know what ugo.cz is built with?: From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.
How far back does the history of ugo.cz go?: To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.
Can I see an older version of a script from ugo.cz?: Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.
Which other websites use the same tracking IDs as ugo.cz?: Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Look up another site, browse sites by tracking ID, third-party host or technology. Site owners: see the crawler page for how stored pages are removed.